Cam structure



Aug. 19, 1930. w. J. MILLER 1,773,539

CAM STRUCTURE Original .Filed May 27, 1926 INVENTOR ZMZZWM Patented Aug. 19, 1930.

umrro STATES PATENT. OFFICE OF HARTFORD, CONNECTICUT, A CORPORATION OF DELAWARE can srnucrunn flriglnal application filed Kay 27, 1928, Serial lid-111,957. Divided and this application filed. August 1928. serial No. 299,732f p and that of lesser diameter 72 at the rear, a

This application for Letters Patent is a division of an application for Letters Patent Serial Number 111,957 filed by me in the United States" Patent Ofiice on May 27th, 1926, now Patent Number 1,738,499.

My present invention, whilemore particularly designed and intended for use in mechanism for feeding molten glass to fabrlcating machines, may be advantageously employed in other artswherein cam-drives are employed.

A characteristic feature of my present invention is a new and improved cam structure which provides for adjustment for varying and regulating the cam-action.

Other novel features of construction and arrangement of-parts will appear from the following description.

In the accompanying drawings, wherein I have illustrated a practical embodiment of the principles of my invention, Fig. l-is a face view of the cam structure.

Fig. 2 is a sectional view of the same taken along the line 2-2 in Fig. 1. 4

Fig. 3 is a sectional view taken along the line M in Fig.2.

Fig.4 is a diametric section of one of the i hub members of the cam structure.

Referring to the drawings, 63 represents a driven shaft upon which the cam-structure is mounted and with which the cam-structure rotates. The cam structure is substantially as follows. r

For convenience of assemblage and disassemblage, the hub of the cam is formed of two parts, the front hub-part 65 and the rear hubpart 66, said parts being fixed to the shaft 63 as by the pins 67. I

Therear hub-part is radially split so that its perimetral surface maybe expanded, as will be more fully described. I

The rear hub-part 66 has a differential exterior perimetral surface, the surface of greater diameter 68 being at the rear and that of less diameter 69 toward the front, the radial shoulder 70 separating the two perimetral' surfaces.

Likewise the front hub-part 65 has a difier ential exterior perimetral surface, the surface of'larger diameter 7lsbeing at the front shoulder 73 separating said perimetral surfaces. The diameter of th'esurface 72 of the the surface 69 of the rear hub-part so that a WILLIAM .1. manna, or swrssvann, rnnnsnvnnu, assronon mo mrnonnv shoulder 7.4 is formed where the hub-parts abut against each other.

The cam-carrier 75 isa ring. which is provided' with a differential bore, the portion" of. greater diameter 76 being at the rear and shpping over the perimetral-surface 69 of, the rear hub-part 66 when'the latter is not expanded, and abutting against the shoulder 70. The front portion 77 of the bore of the cam carrier 75 surrounds the perimetral surmounted onthe shaft and fixedthereto, the cam-carrier is then slipped in place, and then the front hub-part is slipped into place and fixed on the shaft 63.

The bore 7 7 of the cam-carrier 7 5 is toothed to provide an internal gear, and. unless the hub-part 66 is expanded to wedge the camc rrier fixedlythereto, the cam carrier is rotable on the hub. The rear hub-part may be expanded, to fix the cam carrier to the hub by means of a hand screw 78, which screwed in a threaded hole 79 in the front huh-part 65 parallel, with the axis of the hub, and which has a tapered end extending into the split of the rear hub-part, the walls of said split being provided with opposed arcuate v face 72 of the front hub-part; In assembling" the cam-structure, the rear hub-part is first by means of a inion 82 mounted in a socket in the front hu -part and having its rear end reduced and journaled in a bearin in the rear hub-part. The rear portion of t e socket 1s open so that the pinion meshes wlth the mternal gear of the cam-carrier. The front end of the pinion-82 protrudes and is prom vided with a hand knob 83 by means of which the pinion may be turned to rotate the camcarr1er. The inion is prevented from 8061* dental outward movement relative to the hub by means of the locking plate 84 slidably held on the end of the shaft 63 by a headed screw 85 which extends through a slot in said plate, the plate being thus slidable outwardly so that its arcuate end will fit against a c1rcular shoulder on the knob 83. The plate is held fixed in its locking position by means of a binding screw 86 which extends through a hole in said plate and may be screwed into a threaded hole in the end of the shaft 63.

The cam member '87 is a rin having a.

cylindrical bore of differential iameter'so as to he slipped into lace on the cam carrier and on the front ub-part, as shown in Fig. 2, the exterior shoulder of the cam carrier and the interior shoulder Ofdlh cam member being rounded to facihtate the mounting of the cam ring.

The'cam member is held against rotatlon relative to the carrier bymeans of a dowel pin 88 fixed to the carrier and engaging a hole 89 in the cam member. The cam member is also held against accidental'lateral movement relative to the carrier by means of a ball-detent 90 spring mounted in a socket 91 in the carrier and engaging a socket 92 in the wall of the bore of the cam member. I

The perimetral surface of the cam member 87 is the actuating surface of the cam structure and is engaged by the element which is to receive its movement from the cam. Thus I have shown a lever 52 provided with a roller 57 which is in contact with the perimetral surface of the cam 'member'87.

The perimetral surface of the'cam member 87 is given the eccentricit of contour requisite to impart the desire movement to the lever 52 or other element to be. actuated.

The cam members are interchangeable and thus a cam member adapted to produce any desired-character of movement in the controlled element "may be conveniently and quickly substituted.

It is obvious that my improved cam-driving. mechanism is of extremely simple and compact construction and its adjustability I and-convenience makes the same highly useful and advantageous in cam-drives which are laurtgely employed in many ofthe'mechanical a What I desire toclaim is 1. In an actuating cam-structure, the combination of a hub arranged for mounting on a shaft, said hub' being expansible, a cam-carrier rin rotatably mounted on said hub and arrange to be fixed thereon by the expaniioln of the hub, and means for expanding the 2. In an actuating cam-structure, the combination of a hub arranged for moutning'on a shaft, said hub being expansible, a cam carrier ring said hub, said carrier being provided with an' internal gear, a p nion carried by said hub and meshing with said ear whereby to rotate the carrier on the ub, and means for fixing the carrier relative to the hub.

4. In an actuating cam-structure, the combination of a hub, a cam-carrier rotatable on said hub, said hub bein expansible to fix said carrier thereon, sai carrier being provided with an internal ear, a pinion carried b said hub and mes ing with said gear where y to rotate therarrier on the hub, and means for expanding the hub.

5. In an actuating cam-structure, the combination with a shaft, of a hub comprising two parts and arranged to be fixed on the shaft, a cam-carrier mounted on and between said parts and rotatable relative thereto, and means for fixing said carrier relative to said hub parts.

' 6. In an actuating cam-structure, the combination with a shaft, of a hub comprising two parts and arranged to be fixed onthe said shaft, a cam-carrier mounted on and between said parts, one of said hub-parts being ex ansible to fix said carrier re ative to the thu and means for expanding said hub par d 7. In an actuating cam-structure, the combination with a shaft, of a hub comprising two parts and arranged to be fixed on the shaft, a cam-carrier mounted on and between said parts and rotatable relative thereto, mechanismfor rotating the carrier relative to the hub-parts, and means for locking the carrier in position relative to the hub-parts.

8. In an actuating cam-structure, the combination with a shaft, of a hub comprising two parts and arranged to be fixed on the said shaft, a cam-carrier mounted on and between said parts, one of said hub-parts'being exinternal gear whereby to rotate the carrier,

and a cam ring detachably mounted onthe carrier.

i0. In an actuating cam-structure, the combinationof a, hub, a camscarrier rotatable on said hub, said carrier being provided with an internal gear, a pmion mounted on said hub and rotatable on an a xis parallel to the axis Signed at Pittsbuigh, Pa., this 9th day of August, 1928.

' WILLIAM J. MILLER. 

